97 lines
2.2 KiB
Go
97 lines
2.2 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Formatting of reflection types and values for debugging.
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// Not defined as methods so they do not need to be linked into most binaries;
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// the functions are not used by the library itself, only in tests.
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package reflect_test
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import (
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. "reflect"
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"strconv"
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)
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// valueToString returns a textual representation of the reflection value val.
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// For debugging only.
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func valueToString(val Value) string {
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var str string
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if !val.IsValid() {
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return "<zero Value>"
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}
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typ := val.Type()
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switch val.Kind() {
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case Int, Int8, Int16, Int32, Int64:
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return strconv.FormatInt(val.Int(), 10)
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case Uint, Uint8, Uint16, Uint32, Uint64, Uintptr:
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return strconv.FormatUint(val.Uint(), 10)
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case Float32, Float64:
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return strconv.FormatFloat(val.Float(), 'g', -1, 64)
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case Complex64, Complex128:
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c := val.Complex()
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return strconv.FormatFloat(real(c), 'g', -1, 64) + "+" + strconv.FormatFloat(imag(c), 'g', -1, 64) + "i"
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case String:
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return val.String()
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case Bool:
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if val.Bool() {
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return "true"
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} else {
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return "false"
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}
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case Ptr:
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v := val
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str = typ.String() + "("
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if v.IsNil() {
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str += "0"
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} else {
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str += "&" + valueToString(v.Elem())
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}
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str += ")"
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return str
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case Array, Slice:
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v := val
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str += typ.String()
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str += "{"
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for i := 0; i < v.Len(); i++ {
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if i > 0 {
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str += ", "
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}
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str += valueToString(v.Index(i))
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}
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str += "}"
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return str
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case Map:
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t := typ
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str = t.String()
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str += "{"
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str += "<can't iterate on maps>"
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str += "}"
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return str
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case Chan:
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str = typ.String()
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return str
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case Struct:
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t := typ
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v := val
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str += t.String()
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str += "{"
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for i, n := 0, v.NumField(); i < n; i++ {
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if i > 0 {
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str += ", "
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}
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str += valueToString(v.Field(i))
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}
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str += "}"
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return str
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case Interface:
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return typ.String() + "(" + valueToString(val.Elem()) + ")"
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case Func:
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v := val
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return typ.String() + "(" + strconv.FormatUint(uint64(v.Pointer()), 10) + ")"
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default:
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panic("valueToString: can't print type " + typ.String())
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}
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return "valueToString: can't happen"
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}
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